3. Anthocyrtis butomus, n. sp.
Shell thorny, with obliterated collar stricture. Length of the two joints = 2 : 6, breadth = 2 : 7. Cephalis ovate, with very small and scarce pores, and a conical horn of the same length. Thorax inflated, pear-shaped, with regular, circular, quincuncial pores. Mouth about half as broad, constricted, with nine divergent, broad, nearly square, lamellar feet, half as long as the thorax (similar to Anthocyrtis serrulata, Ehrenberg, loc. cit., Taf. vi. fig. 7).
Dimensions.—Cephalis 0.05 long, 0.04 broad; thorax 0.12 long, 0.14 broad.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
4. Anthocyrtis ventricosa, Ehrenberg.
Anthocyrtis ventricosa, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. viii. fig. 1.
Shell thorny, with obliterated collar stricture. Length of the two joints = 1 : 7, breadth = 2 : 7. Cephalis hemispherical, hyaline, without pores, with a slender, conical horn, of about the same length. Thorax inflated, pear-shaped or subspherical, with regular, circular, quincuncial pores. Mouth only one-third as broad, much constricted, with nine divergent, slender, conical feet, about one-fifth as long as the diameter of the shell (partly broken off in Ehrenberg's figure).
Dimensions.—Cephalis 0.03 long, 0.04 broad; thorax 0.14 long, 0.14 broad.
Habitat.—Tropical Atlantic, Station 338, depth 1990 fathoms; also fossil in Barbados.